A contribution to the kinetic solution of more complex reaction schemes

Mass-spectrometric studies of rate constants for addition reactions of hydrogen and of deuterium atoms with olefins in a discharge-flow system at 300.deg.K

“…Values of the absolute rate constant for the addition of atomic hydrogen to ethylene have been determined by a variety of experimental techniques, but show an order of magnitude spread and a critical choice of the most reliable value is difficult to make.3 Several measurements of , relative rates for olefins also lack consistency, with the exception of three independent photochemical studies by Cvetanovié and co-workers. [4][5][6] In Table I, mean values of the relative addition rates obtained by Cvetanovié's group are compared with those of other systematic studies.7•8…”

Extending the continuum of molecular weight distributions based on the generalized exponential (Gex) distributions

“…Extrapolation to higher molecular weights Mz+l or Mz+2 require that the k that best corresponds to the data must have values smaller than -4 or -5, respectively, If k = -6, m remaining negatively valued, eqs. (1)- (5) are true, but the next higher molecular weight, Mz+3, would have zero value. This is one limitation of Gex models, but in practice one seldom finds molecular weights higher than z + 1.…”

“…(1)- (5), the parameter t and the molecular weights are always positively valued. In cases where both parameters m and k are negatively valued, the evaluation of parameter m requires that k < -3.…”